Fix comment in contrib/gen_autofdo_event.py

[Tom de Vries]

Hi,

a comment generated by contrib/gen_autofdo_event.py instructs the user 
to use '--shell' with gen_autofdo_event.py, but the script does not 
support it.

This patch fixes the comment by using '--script' instead (this is also 
the usage printed by the script generated by contrib/gen_autofdo_event.py).

Committed as obvious.

Thanks,
- Tom
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